Ravel Toccata

[wilmerguido]

I'm having problems with the 4th  to 7th bar. My reach is a tenth, but I can't play the chords with the F#. I can reach it no problem, but to play it a tempo, is a different thing...  Should I omit the F# completely, or should I practice it as is, and hope that eventually i'll be able to play it a tempo. What could be the problem here...since I'm beginning to doubt that the problem lies withing my hand span? Since my wrist muscles start to hurt when I keep on practicing that passage over and over again